Shuttle for sewing-machines



(No Model.)

J. BOLTON. SHUTTLE FOR SEWING MACHINES.

Patented Mar. 8, 1 892.

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NlE STATES PATENT OFFICE.

JAMES BOLTON, OF CHICAGO, ILLINOIS.

SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent iNo. 470,283, dated March 8, 1892.

Application filed July 19, 1890. Renewed January 29, 1892- Serial No. 419,623. (N model.)

To aZZ whom it may concern.-

Be it known that I, JAMES BOLTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and 'useful Improvements in Sewing-Machine Shuttles, of which the following is a specification, reference being had therein to the accompanying drawlngs.

My invention has for its object to provide a cylindrical sewing-machine shuttle from which the thread will run smoothly and evenly and which is more especially adapted for use in machines having vertically-vibrating shuttie-drivers.

In the accompanying drawings, Figure 1 is a top or plan View of my improved shuttle. Figs. 2 and 8 are opposite side views thereof. Fig. 4 is a cross-section on line 4 4:, Fig. 1. Fig. 5 is a plan view of my shuttle with the tension-spring removed, and Fig. 6 is a detail View of the tension-spring.

A denotes the body of the shuttle, which is provided at its heel with a diagonal openended threading slot a, running into the larger thread-delivery slot 1).

The body A is provided on its face side a,

- which is mainly fiat, as more clearly shown in Figs. 3 and 4, (but which is rounded or cut away on-the lower part of said face side at at) with an integral segmental rib a, projecting above the said body and provided with an undercut recess (1, into which extends the edge of the thread-distributer 6, formed on the tension-spring f, said thread-distributer overlying the said thread-delivery slot 12. The rib c bears against a curved overhanging lip on a vertical shuttle-race, when the shuttle is in use in the machine shown in my applica tion, Serial No. 359,279, filed simultaneously herewith, and thus serves to steady and guide the shuttle, and it also serves, when provided with the undercut recess d, as a housing for the thread-distributer, so that the latter cannot catch the loops of needle-thread and cannot be injured or bent in use.

By forming the face side a of my cylindrical shuttle mainly flat and extending the fiat portion to the point of the shuttle the latter will have a firm bearing against the vertical race on which it is vibrated and will have its point against the shuttle-race, and by rounding the lower part a of the said flat face proper space is left between the shuttle and its race for the thread carried by the eye of the needle when said needle-eye is below the shuttle during the early part of the forward movement of the latter in passing through a loop of needle-thread, so that said rounded or cut-away part a of the flat face of the shuttle prevents the needle-thread from binding between the shuttle and its race. The rear end of the tension-spring loosely overlies the diagonal threading-slot a and protects the end of the same, so that loops of needle-thread cannot catch therein.

When the threaded shuttle is in operation, the thread in emerging at the delivery-slot 1) draws over the thread-distributor e into the slotted eye g, (which latter is about midway the length of said distributer,) thence beneath the tension-spring to the slotted eye h, next over the fin h, and thence rearward beneath the thread-guard t' in the usual manner. As the thread pays out, it runs from one end of the bobbin to the other, and in doing so it draws evenly over the curved thread-distributer, so that there is no danger of breakage, even when the bobbin is nearly empty.

My shuttle-body has a straight lower edge and an integral upper edge curved in the true are of a circle and meeting said straight lower edge at the point of the shuttle, thus making the same what is known in the art as a high-pointed shuttle, or a shuttle the point of which is at the top of a vertical shuttle-race when taking a loop of needle-thread, and being thereby adapted for use with comparatively short needles.

I claim 1. A cylindrical sewing machine shuttle having a fiat front or hearing face provided at its upper edge with an integral longitudinal segmental rib c, projecting above the body of the shuttle, substantially as set forth.

2. A sewing machine shuttle having a thread-delivery slot and a flat front or hearing face provided on its upper edge with a longitudinal segmental rib c, projecting above the body of the shuttle and having a recess on its inner side, or the side opposite said face, combined wit-h a tension-spring provided too with a curved thread-distributer overlying said slot and having its edge over which the thread passes housed in the said recess.

3. A cylindrical sewing-machine shuttle the body of which has a straight lower edge and an integral upper edge curved in the true are of a circle and intersecting or meeting the said straight lower edge at the point of the shuttle, substantially as set forth.

4. A cylindrical sewi11g-macl1ine shuttle having a flat front face a, which extends to the point of the shuttle and the lower part a of which is rounded or cut away, as shown, the said shuttle having a straight lower edge and an upper edge which is curved in the true are of a circle and which intersects the said straight lower edge at the point of the shuttle.

In testimony whereof I aflix my signature in presence of two witnesses.

JAMES BOLTON.

Witnesses:

EDWARD F. OBRiEN, HENRY CALVER. 

